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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05cd0bc254c9d319d054ef8be615a4a40d128052c000b857202e5cd2ae78086f' 
  AND token = 'fxeAkb1fKqShw4O50+QioX+XFK8ghzQjIsjgIUUqUE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}